fix(oidc apps): correctly remove last additional origin, redirect uri and post logout redirect uri (#9209)

# Which Problems Are Solved

A customer reached out to support, that the (last) `additional origin`
could not be removed. While testing / implementation it was discovered,
that the same applied to `redirect_uris` and `post_logout_redirect_uris`

# How the Problems Are Solved

- Correctly set the corresponding array to empty in the event so it can
be differentiated to `null` / not set in case of no change.

# Additional Changes

Replaced `reflect.DeepEqual` with `slices.Equal`

# Additional Context

- Reported to support

(cherry picked from commit c9aa5db2a5)

internal/repository/project/oidc_config.go

@@ -284,6 +284,10 @@ func ChangeVersion(version domain.OIDCVersion) func(event *OIDCConfigChangedEven
 
 func ChangeRedirectURIs(uris []string) func(event *OIDCConfigChangedEvent) {
 	return func(e *OIDCConfigChangedEvent) {
+		if uris == nil {
+			// explicitly set them to empty so we can differentiate "not set" in the event in case of no changes
+			uris = make([]string, 0)
+		}
 		e.RedirectUris = &uris
 	}
 }
@@ -314,6 +318,10 @@ func ChangeAuthMethodType(authMethodType domain.OIDCAuthMethodType) func(event *
 
 func ChangePostLogoutRedirectURIs(logoutRedirects []string) func(event *OIDCConfigChangedEvent) {
 	return func(e *OIDCConfigChangedEvent) {
+		if logoutRedirects == nil {
+			// explicitly set them to empty so we can differentiate "not set" in the event in case of no changes
+			logoutRedirects = make([]string, 0)
+		}
 		e.PostLogoutRedirectUris = &logoutRedirects
 	}
 }
@@ -356,6 +364,10 @@ func ChangeClockSkew(clockSkew time.Duration) func(event *OIDCConfigChangedEvent
 
 func ChangeAdditionalOrigins(additionalOrigins []string) func(event *OIDCConfigChangedEvent) {
 	return func(e *OIDCConfigChangedEvent) {
+		if additionalOrigins == nil {
+			// explicitly set them to empty so we can differentiate "not set" in the event in case of no changes
+			additionalOrigins = make([]string, 0)
+		}
 		e.AdditionalOrigins = &additionalOrigins
 	}
 }